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A family of six, including two young girls, were responsible for Islamic State-claimed suicide attacks that killed at least 11 and injured dozens during Sunday church services in Indonesia, national police chief Tito Karnavian said.

The family -- a mother and father, two daughters aged 9 and 12, and two sons aged 16 and 18 -- were linked to local extremist network Jamaah Ansharut Daulah, which supports IS, Karnavian said.

Indonesian president Joko Widodo slammed the attacks, telling reporters: "We must unite against terrorism." "The state will not tolerate this act of cowardice," he added.

(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)